Fe57 Mössbauer study of the superconductor YBa2(FexCu1−x)3Oy
E. Baggio-Saitovitch, I. Souza Azevedo, R. B. Scorzelli, H. Saitovitch, S. F. da Cunha, A. P. Guimares, P. R. Silva, A. Y. Takeuchi
DOI 10.1103/PhysRevB.37.7967 · Physical Review B
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Abstract
Fe57 Mössbauer measurements were made on the YBa2(FexCu1−x)3Oy superconducting compounds, for the Fe concentrations of x=0.001, 0.005, 0.01, 0.03, and 0.1. The Mössbauer spectra, obtained from 4.2 K to room temperature, are dependent on concentration and show several quadrupole doublets that can be related to different Cu sites, to the number of oxygen vacancies, and to the presence of a high-temperature tetragonal phase. Two doublets in the dilute samples (up to x=0.01) are associated to Fe57 in the Cu1 site of the compound with different oxygen configurations. X-ray diffraction and Mössbauer spectroscopy indicate that the YBaCuO structure is strongly perturbed for higher iron concentration. dg magnetization measurements show a correlated decrease of the transition temperature Tc. The 4.2-K spectra of the more concentrated samples (x=0.03 and 0.1) show complex magnetic hyperfine patterns indicating the presence of magnetic moments on the Fe.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2(FexCu1-x)3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91.6 | Pressure not reported | onset |
| YBa2(FexCu1-x)3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88 | Pressure not reported | onset |
| YBa2(FexCu1-x)3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 56 | Pressure not reported | onset |
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